Method to apply an insulation

Abstract

The present disclosure relates to a method to apply an insulation to a retaining ring for end windings of an electric machine and to a fillable bag to apply an insulation to a retaining ring. Disclosed is a method to apply an insulation to a retaining ring for end windings of an electric machine, with the steps of providing a retaining ring housing, attaching an insulation at the inside of the retaining ring housing, and inflating a bag inside the retaining ring housing to apply pressure to the insulation. Also disclosed is a fillable bag to apply a pressure to an electric insulation inside a retaining ring for end windings of an electric machine.

What is claimed is: 
     
       1. A method to apply an insulation to a retaining ring, the retaining ring used for end windings of an electric machine, comprising the steps of:
 providing a retaining ring housing; 
 attaching an insulation to an inside face of the retaining ring housing; 
 inserting a bag inside the retaining ring housing, the bag abutting the insulation; and 
 filling or inflating the bag with a medium, inside the retaining ring housing to apply pressure to the insulation and to the inside face of the retaining ring housing. 
 
     
     
       2. The method according to  claim 1 , wherein the bag comprises a chloroprene tissue. 
     
     
       3. The method according to  claim 2 , further comprising fabricating the bag from chloroprene tissue with at least two glued layers. 
     
     
       4. The method according to  claim 3 , wherein the glue is a bonding resin. 
     
     
       5. The method according to  claim 1 , further comprising applying pressure to insulation inside the retaining ring with a pressure below nine bar. 
     
     
       6. The method according to  claim 1 , further comprising filling the bag with a liquid medium. 
     
     
       7. The method according to  claim 1 , further comprising inflating the bag with air. 
     
     
       8. A fillable bag to apply a pressure to an insulation attached to an inside face of a retaining ring, the retaining ring used for end windings of an electric machine, wherein the insulation is attached to the inside face of the retaining ring according to the method of  claim 1 .